FUNGOID PESTS OF CULTIVATED PLANTS. 13 



GLOBE FLOWEK LEAF-SPOT. 

 Phyllosticta Trollii (Trail). 



This parasite has only recently been found on the leaves of Trollius 

 europcens in Scotland. 



It forms irregular brown spots on the leaves, which are usually limited 

 by the veins, and the receptacles, or perithecia, are scattered over the spots, 

 on the under surface. 



The sporules, which are produced within the perithecia, are very 

 minute (4x1 p ), obtuse at each end and colourless. 



Should it ever become aggressive, it would be well to try spraying with 

 a copper solution. 



Trail, Trans. Crypt. Soc. Scot. 1889, p. 43 ; Sacc. Syll x. 5003. 



The Globe Flower Brand (Puccinia Trollii, K.) has only been recorded 

 in Italy, Switzerland, and Lapland. 



Two other leaf-spots are known to occur on the leaves of Trollius, 

 namely, Ascochyta Trollii, with two-celled sporules, only known in Siberia, 

 and Septoria Trollii, with long thread-like sporules, near Lake Lucerne 

 in Switzerland. 



ACONITE DISEASES. 



Hitherto none of the special diseases which attack the Aconites have 

 been recorded for this country. Septoria Napelli (Speg.) has occurred in 

 Italy, and also Septoria Lycoctoni (Speg.). 



JEcidium Aconiti- Napelli (DC.) and Uromyces Aconiti- Lycoctoni 

 (DC.), the former in France, Germany, and Switzerland, the latter 

 in Italy, Switzerland, France, Germany, Hungary, and Siberia, are not 

 British, whilst JEJcidium circinans is confined to Scandinavia. 



An Aconite white mould Eamularia monticola (Speg.) is also recorded 

 for Italy. 



LARKSPUR DISEASES. 



At present we have been spared the infliction of these diseases, of 

 which Septoria Delphinella (Sacc.) is found in France. The mould called 

 Cercospora Delphinii (Thiim.) is still Siberian, whilst Puccinia Delphinii 

 (Diel) is Californian. 



ANEMONE ROT-MOULD. 

 Plasmopara pygmcea (linger), PI. VI. fig. 6. 



This " rot-mould " is similar in character to that already described as 

 occurring on Hellebore, and is found on the leaves of Anemone as well as 

 sometimes on Aconite. 



The threads are often in bundles of two to six together, and are either 

 simple or branched above, the branches are either simple or once or twice 

 forked, the tips surmounted by from two to four short conical branchlets 

 supporting the conidia. The latter are elliptical, of variable size (18- 

 25 x 15-20 fj), with the apex broadly and obtusely teat-like. 



In the interior of the plant the resting spores are produced from the 



